Patent GB-334661-A (GB)
Title: Improvements in rotary printing presses
IPC: B65H23/188
Filed: 1929-07-17
Abstract: 334,661. Black, H. D. July 17, 1929. Fceding and registering webs.-A high-speed rotary printing-press is provided with means for feeding a previously printed inset web in register with the webs being printed by the press, such means including a conveyer roller engaging and travelling with the web for a predetermined period and associated with means for detecting variations of register and causing the operation mechanically of mechanism for correcting the variation. The mechanism is of similar character to that described in Specification 316,956 in which the correcting-mechanism is controlled electrically or pneumatically. In one form, Fig. 1, the previously printed inset web 1, which is provided with regularly spaced perforations, passes from a roll 1<a> between feed rollers 4, 5, over a registering roller 10, and thence over a conveyer roller 15 provided with radial spring- pressed pins 21, 22 which in the normal running of the press are arranged as shown in Fig. 9 just to the left and to the right of the regularly spaced perforations 26 in the web 1. The pins are pressed into the conveyer 15 by means of a fixed plate 15a, and are maintained within the conveyer 15 by the web 1 if in correct register. If the web 1 creeps out of register one of the pins 21, 22 is protruded radially and engages a corresponding curved lever 27, 28, Fig. 2, the lever engaged is moved in the direction of the arrow E, against the action of a spring, and the movement of the lever is transmitted by means of Bowden wires 35, 36 to one of a corresponding pair of levers 37, 38, Fig. 4, which normally retain by the aid of spring catches 57 a pair of spring-pressed clutch levers 42, 43 in declutched position so that no motion is transmitted from either of two shafts 51, 52, Fig. 1, to a governor shaft 46. The shafts 51, 52 are driven in opposite directions from a motor 56, and when one of the levers 37. 38 is operated a disc 44 on the shaft 51 or a disc 45 on the shaft 52 is clutched to the shaft 51 or 52 for one revolution, and the governor shaft 46 is driven by friction from the disc 44 or the disc 45 in a corresponding direction. When the lever 37 or 38 returns to normal position the corresponding clutch lever is automatically declutched and held in this position by the catch 57. The levers 27, 28 are carried by a bar 30 which is reciprocated in a direction axially of the conveyer roller 15 by means of .face cams on the roller, and the levers are thus brought alternately in the line of action of the pins 21, 22, and are actuated gradually by the pins as these are rotated by the conveyer roller. The governor shaft 46 actuates by bevel gearing a vertical shaft 59 which by means of worm gearing 60, 61 rotates the shaft of the arm 12 carrying the registering-roller 10, so as to correct the register of the web. The shaft 59 also varies the speed of the web by actuating by worm gearing 62, 63 a shaft 9<a> which is formed at one end with a screw engaging a threaded hole in the machine frame, and at the other end with a tapered portion which controls the expansible elements of a pulley on a shaft which is geared to the feed rollers 4, 5. In a modification, Fig. 10, the pins 21, 22 extend into the conveyer roller 15 and control the motion of members 66, 67 pivoted to push rods 68, 69 normally pushed to the left by springs 70. Tappet rods 75, 76 are reciprocated axially within the roller 15 by the action of rollers 77, 78 on a fixed cam 79, and when the web needs correction one of the members 66, 67, is depressed to cause the rod 69 or 68 to be engaged by the tappet rod 76 or 75 and to be moved to the right thereby. The rods 68, 69 actuate pivoted members 73, 74 connected to Bowden wires 36. The Bowden wire controls may be replaced by pneumatic or hydraulic or similar impulse producing means arranged to effect the movements of the levers 37, 38, Fig. 4. In a further modification, Fig. 15, the registering-roller 10 is carried by slide blocks 112 guided by vertical rods 115 and capable of vertical adjustment by screws 111 connected at their upper ends by bevel gearing comprising a horizontal shaft which is also geared by sprocket gearing to a tapered screw member for operating an expansible pulley for controlling the speed of the feed rollers 4, 5, Fig. 1. The screws 111 are actuated to correct the register under the control of sliding cone clutches 102, 106, 103, 107, the movement of which is controlled by forked levers operated by a lever arm on a shaft 92, the rotations of which are controlled from the pins 21, 22 in a manner similar to that described in connection with Fig. 10. The pins 21, 22 control pivoted members 81, 82, which effect connection between cam-operated tappet rods 75, 76, and push rods 68, 69 capable of causing pins 85, 86 to protrude from the left side of the conveyer roller 15. The pins 85, 86 act on a cam surface 90 on a lever arm 91 on the shaft 92. The pins 21, 22 are withdrawn into the conveyer roller by cam mechanism for the portion of the revolution of the conveyer roller in which the pins are not in contact with the inset web. In order to correct a large error in the register of the webs, the pins 21, 22 may be replaced by a series of ten pins 21<a>, 22<a>, Fig. 20, and the correcting mechanism is actuated if one pin 21b passes through a perforation in the inset web, or if a number of pins pass through. In the latter case the register may be corrected after a number of operations of the correcting mechanism. The pins 21<a>, 22<a> are withdrawn into the roller 15 during the intervals when they are not retained in position by the inset web as described in connection with the modification shown in Fig. 15. The sensitiveness of the detecting-mechanism may be controlled by the relationship between the size of the pins in the conveyer roller and the size of the perforations in the web. Specifications 7892/02, 26128/02, and 13363/03 also are referred to.